Ghana Blocks Exxon Oil-Field Deal

LAGOS, Nigeria—The government of Ghana blocked the estimated $4 billion sale of a stake in a huge oil field, foiling months of talks between potential buyer Exxon Mobil Corp. and the stake's owner, Kosmos Energy LLC.

The government accused Dallas-based Kosmos of cutting Ghana's state-run oil company out of discussions about the field's development and then sharing information about the field with potential buyers without government permission. The government in recent months itself has scouted for partners to work with Ghana's...